Cited by 94Neuroendocrine regulation and behaviorChild Abuse and TraumaMemory and Neural Mechanisms

Early life adversity during the infant sensitive period for attachment: Programming of behavioral neurobiology of threat processing and social behavior

Open access
Opendak, Maya, Gould, Elizabeth, Sullivan, Regina·2017·Developmental Cognitive Neuroscience

Abstract

Animals, including humans, require a highly coordinated and flexible system of social behavior and threat evaluation. However, trauma can disrupt this system, with the amygdala implicated as a mediator of these impairments in behavior. Recent evidence has further highlighted the context of infant trauma as a critical variable in determining its immediate and enduring consequences, with trauma experienced from an attachment figure, such as occurs in cases of caregiver-child maltreatment, as particularly detrimental. This review focuses on the unique role of caregiver presence during early-life trauma in programming deficits in social behavior and threat processing. Using data primarily from rodent models, we describe the interaction between trauma and attachment during a sensitive period in early life, which highlights the role of the caregiver's presence in engagement of attachment brain circuitry and suppressing threat processing by the amygdala. These data suggest that trauma experienced directly from an abusive caregiver and trauma experienced in the presence of caregiver cues produce similar neurobehavioral deficits, which are unique from those resulting from trauma alone. We go on to integrate this information into social experience throughout the lifespan, including consequences for complex scenarios, such as dominance hierarchy formation and maintenance.

AI snapshot

Written from the paper’s full text.

TL;DR

This review argues that early-life trauma occurring within the attachment context—abuse from a caregiver or trauma in the caregiver’s presence—during a sensitive period programs lasting deficits in threat processing and social behavior, with the amygdala as a key mediator. Rodent models show that caregiver presence engages attachment circuitry and suppresses amygdala-dependent threat learning, producing outcomes distinct from trauma alone.

Key findings

  • During the rat sensitive period for attachment (PN<9), low corticosterone blocks amygdala plasticity; odor-shock conditioning instead produces odor approach/attachment learning via elevated norepinephrine and olfactory bulb/anterior piriform circuitry. After PN9, pups alone can learn amygdala-dependent fear if corticosterone rises, but the mother’s presence socially buffers the stress response and reverts pups to preference learning until about PN15.
  • Abuse from the caregiver (e.g., low-bedding maternal maltreatment) or repeated odor-shock paired with maternal odor during the sensitive period produces latent amygdala-dependent deficits: decreased social exploration in adolescence, depressive- and anxiety-like behavior in adulthood, impaired threat/aversion learning, and blunted amygdala activation during fear conditioning. These effects are not produced by shock alone or unpaired odor-shock.
  • Direct abuse and paired odor-shock produce indistinguishable neurobehavioral outcomes. Corticosterone injection uncovers deficits—disordered attachment, decreased approach to maternal odor, less nipple attachment, and amygdala hyperactivity—in abused or paired odor-shock pups, but not in pups reared by a nurturing mother or given shock trauma alone.
  • The review proposes that early caregiver abuse may impair dominance hierarchy formation and maintenance through altered aggression, threat response, social exploration, and sexual motivation; subordinate rats in visible burrow systems show elevated corticosterone, increased illness/weight loss, reduced activity and social behavior, and increased defensive responses.

Methods

  • Narrative review synthesizing rodent, nonhuman primate, and human literature, with a focus on species-atypical abusive maternal care in rodent models.
  • Data primarily from rodent paradigms including odor-shock fear conditioning, low-bedding maternal abuse, maternal social buffering, and visible burrow system dominance studies; no new empirical data are reported.
  • Main analysis is conceptual integration of cited findings; no systematic search strategy or quantitative synthesis is stated.

Limitations

  • The paper states that translating rodent data to humans can be challenging and that future work is needed to determine whether humans engage the same neural circuitry for attachment and whether the child brain is predisposed toward odor preferences at this age.
  • The paper notes that many effects of early-life trauma remain latent until peri-adolescence, making abused children difficult to identify without physical evidence; the specific time-course of the human stress hypo-responsive period is unknown, and oxytocin’s role in very early life and the attachment sensitive period remains unclear.
  • Evident from the text: this is a narrative review rather than a systematic or meta-analytic synthesis, it relies heavily on rodent models, several cited findings are “in press,” and the dominance hierarchy consequences are largely proposed/putative rather than directly tested in abused animals.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.1016/j.dcn.2017.02.002

Cites

310 of 310 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

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  • Findingown data

    Trauma experienced in the presence of the caregiver has similar neurobehavioral consequences as trauma experienced directly from an abusive caregiver.

    “In particular, we have observed that trauma experienced in the presence of the caregiver has similar neurobehavioral consequences as trauma experienced directly from an abusive caregiver; these socially anchored traumas produce unique and profound effects that go beyond those of trauma alone.”
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  • Premisecitation

    Trauma experienced from an attachment figure during a sensitive window in early life can produce life-long deficits in threat processing and social behavior across many species.

    “In particular, trauma experienced from a caregiver during a sensitive window in early life can produce life-long deficits in threat processing and social behavior across many species (Amaral, 2003, Callaghan et al., 2014, McEwen, 2003, Moriceau et al., 2006, Tang et al., 2014, Tzanoulinou and Sandi, 2017, Zeanah et al., 2003).”
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  • Premisecitation

    Soothing a stressed infant can lower stress hormone levels.

    “In turn, this stimulation of the infant's sensory systems changes physiology; for example, soothing a stressed infant can lower stress hormone levels (Gunnar and Quevedo, 2007, Gunnar et al., 2007, Hofer, 1994, Sarro et al., 2014a, Sarro et al., 2014b).”
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  • Premisecitation

    Bowlby's Attachment Theory described the infant brain of altricial species as designed to support attachment to the caregiver, even when the quality of care is compromised or abusive, during a temporally defined sensitive period.

    “Indeed, John Bowlby’s Attachment Theory described the infant brain of altricial species as designed to support attachment to the caregiver, even when the quality of care is compromised or abusive, during a temporally defined sensitive period (Bowlby, 1965, Bowlby, 1978).”
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  • Premisecitation

    In typically developing children, caregiver regulation of infant physiology is critical for a child's interaction with the world, including reduction of fear, response to novelty, and learning.

    “In typically developing children, this caregiver regulation of infant physiology has been shown to be critical for a child’s interaction with the world, including reduction of fear, response to novelty, and learning (Humphreys and Zeanah, 2015, Gee et al., 2013, Nachmias et al., 1996).”
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    Premisecitation

    Hippocampus-dependent contextual fear learning emerges around postnatal day 23 in rodents.

    “For instance, hippocampus-dependent contextual fear learning emerges around postnatal (PN) day 23 in rodents (Raineki et al., 2010a), while other hippocampal dependent learning behaviors emerge either before or after this age (Moye and Rudy, 1987, Stanton, 2000).”
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    In rat pups, learning of maternal odor begins in the prenatal environment, where amniotic odors can guide nipple attachment as soon as pups are born.

    “In rat pups, this learning process begins in the prenatal environment, where amniotic odors can guide nipple attachment as soon as pups are born.”
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    The amygdala and hippocampus become functionally mature in normal rearing conditions at PN10 and PN23, respectively.

    “Evidence from rodent studies on development of the amygdala and hippocampus show a similar developmental time course; both regions demonstrate considerable growth during the initial postnatal period and become functionally mature in normal rearing conditions at PN10 and PN23, respectively (Chareyron et al., 2012b, Raineki et al., 2010a, Raineki et al., 2010c).”
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    Premisecitation

    The amygdala is the critical structure involved in the formation and storage of conditioned fear associations, but it also has a role in many emotional functions including social odor processing and assessing hedonic value of stimuli.

    “The amygdala is considered to be the critical structure involved in the formation and storage of conditioned fear associations (Davis et al., 1994, Phelps and LeDoux, 2005), but it has a role in many emotional functions, including those unrelated to fear, such as social odor processing and assessing hedonic value of stimuli (Holland and Gallagher, 2004, Maren and Fanselow, 1996, Phelps and LeDoux,”
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    Premisenone given

    Attachment to a caregiver during a sensitive window is of paramount importance to altricial infant survival due to the infant's greatly reduced ability to acquire food, protection, and warmth.

    “Attachment to a caregiver during a sensitive window is of paramount importance to altricial infant survival due to the infant’s greatly reduced ability to acquire food, protection, and warmth.”
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    Neonatal amygdala connectivity correlates with fear responses at six months of age in human infants.

    “It has been suggested that neonatal amygdala connectivity correlates with fear responses at six months of age in human infants (Graham et al., 2016).”
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    Pups without the ability to smell rarely survive as they frequently fail to nipple attach and can become malnourished.

    “Indeed, pups without the ability to smell rarely survive as they frequently fail to nipple attach and can become malnourished (Landers and Sullivan, 2012).”
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    The amygdala-hippocampus-PFC circuit is crucial for threat detection and many forms of social behavior, but the maturation and connectivity between these brain regions develops slowly over early life in humans, nonhuman primates, and rodents.

    “The amygdala-hippocampus-PFC circuit is crucial for threat detection and many forms of social behavior, but the maturation and connectivity between these brain regions develops slowly over early life in humans (Casey et al., 2005, Gee et al., 2013, Graham et al., 1999, Malter Cohen et al., 2013, Skuse et al., 2003, Tottenham, 2012, Tottenham and Sheridan, 2009), nonhuman primates (Bachevalier and”
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    Amygdala volume peaks in pre-adolescence.

    “Furthermore, volumetric analysis indicates that amygdala volume peaks in pre-adolescence (Uematsu et al., 2012).”
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    Premisecitation

    A neutral odor can acquire the valence of a maternal odor if placed into the amniotic fluid a few days before birth, suggesting the odor itself is arbitrary for both rats and mice.

    “Even a neutral odor can acquire the valence of a maternal odor if placed into the amniotic fluid a few days before birth, suggesting the odor itself is arbitrary for both rats and mice (Hepper and Cleland, 1998, Leon, 1992, Logan et al., 2012, Pedersen and Blass, 1982, Smotherman and Robinson, 1987, Sullivan and Leon, 1986, Sullivan and Wilson, 1991).”
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    Premisecitation

    During the first ten days of life, learning-associated plasticity for new maternal odors in rat pups occurs within the olfactory bulb and requires an odor paired with copious amounts of NE.

    “During the first ten days of life, the learning process for new maternal odors in rat pups occurs through a relatively simple neurobiological substrate. At this early age, learning-associated plasticity occurs within the olfactory bulb, the first relay station for olfactory processing. This process requires that an odor is paired with copious amounts of NE (Sullivan et al., 2000b, Sullivan et al.,”
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    The sole source of NE to the olfactory bulb is the LC, and this structure's unique physiology during early life is essential for neonatal odor approach learning.

    “The sole source of the NE to the olfactory bulb is the LC, and this structure’s unique physiology during early life is essential for neonatal odor approach learning.”
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    Premisenone given

    Shock induces activation of the HPA axis and CORT release, which is necessary for the young amygdala to learn.

    “A critical feature of this learning is that shock induces activation of the HPA axis and CORT release, which is necessary for the young amygdala to learn.”
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    Premisecitation

    Social buffering describes the reduction of both the stress response and release of stress hormones, and has been observed in myriad species and throughout the lifespan.

    “Social buffering is a phenomenon that has been observed in myriad species and throughout the lifespan and describes the reduction of both the stress response and release of stress hormones (Ditzen and Heinrichs, 2014, Hennessy et al., 2009, Hostinar et al., 2015, Kikusui et al., 2006, Sanchez et al., 2015, Sullivan and Perry, 2015, Takahashi et al., 2013).”
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    Human infants show learning of caregiver cues across multiple sensory modalities, enabling them to form attachments to adoptive parents and caregivers of either sex.

    “Human infants also show learning of caregiver cues across multiple sensory modalities (DeCasper and Fifer, 1980, Sullivan et al., 2011), which enables them to form attachments to adoptive parents and caregivers of either sex.”
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    The sensitive period terminates when pups are around 10 days old, as the LC becomes more adult-like: NE release is greatly restricted due to development of recurrent collaterals that quickly self-inhibit the LC's response.

    “The sensitive period terminates when pups are around 10 days old, as the LC becomes more adult-like: NE release is greatly restricted due to the development of recurrent collaterals that quickly self-inhibit the LC’s response.”
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    At birth, rat pups have a functional HPA axis that soon becomes hypo-responsive and not activated by most painful stimuli, a period termed the stress hypo-responsive period (SHRP).

    “For example, at birth, rat pups have a functional HPA axis, although it soon becomes hypo-responsive and not activated by most painful stimuli, a period of life termed the stress hypo-responsive period (SHRP) (Dallman, 2000, Stanton and Levine, 1985).”
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    Premisereasoning

    The odor takes on qualities of the maternal odor to support nipple attachment and enhance prosocial behaviors to the mother.

    “The odor also takes on qualities of the maternal odor to support nipple attachment and enhance prosocial behaviors to the mother.”
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    NE plays a critical role in bond formation in numerous species, suggesting it is a phylogenetically conserved system.

    “Although it remains unclear whether learning in human infants is the same as the rodent, NE plays a critical role in bond formation in numerous species (Nelson and Panksepp, 1998, Numan and Young, 2016), suggesting it is a phylogenetically conserved system.”
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    Premisereasoning

    If the mother is present, she socially buffers the pup's stress response, and pups revert to sensitive period learning and learn an odor preference.

    “However, if the mother is present, she socially buffers the pup’s stress response, and pups revert to sensitive period learning and learn an odor preference (red dashed line).”
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    The anterior piriform is activated by odors learned during the sensitive period, while the posterior piriform is engaged in response to learned odor in older pups and adults.

    “In particular, the anterior piriform is activated by odors learned during this sensitive period, while the posterior piriform is engaged in response to learned odor in older pups and adults (Moriceau and Sullivan, 2006, Moriceau et al., 2006, Roth and Sullivan, 2005).”
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    Premisenone given

    Early infants learn attachment regardless of quality of care; older infants (PN10-PN15) learn fear when away from mother or attachment if with mother.

    “Early infants will learn attachment regardless of the quality of care, while slightly older infants (PN10-PN15) will either learn to fear a traumatic associated stimulus when away from the mother or learn an attachment if acquisition takes place with the mother.”
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    Only early life trauma associated with attachment leads to lifelong amygdala-dependent behavioral deficits, such as poor social behavior (onset prior to weaning) and depressive-like behaviors (onset post-weaning).

    “Testing later in life shows that only the early life trauma associated with attachment will lead to lifelong amygdala-dependent behavioral deficits, such as poor social behavior (onset prior to weaning) and depressive-like behaviors (onset post- weaning (Raineki et al., 2012, Raineki et al., 2010b, Sevelinges et al., 2011, Sullivan et al., 2000a, Sullivan et al., 2000b).”
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    In adulthood, early trauma produces enhanced aggression and impaired threat response.

    “In adulthood, early trauma produces enhanced aggression (Marquez et al., 2013) and impaired threat response (Perry, in press).”
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    Premisecitation

    Pairing painful maternal care with a novel peppermint odor does not activate the survival circuit for aversion learning; instead pups learn to approach the odor, which takes on qualities of maternal odor.

    “Pairing this painful maternal care with a novel peppermint odor does not activate the important survival circuit within the brain to support aversion learning. Rather, pups not only learn to approach this odor, but this odor takes on the qualities of maternal odor to support nipple attachment and prosocial behaviors (Roth and Sullivan, 2005, Sullivan et al., 1986, Sullivan et al., 2000a).”
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    Pups reared by an abusive mother during the SHRP receive CORT through her milk and her social buffering is compromised; when trained on peppermint odor-shock outside the nest at PN7, they learn an aversion through amygdala-dependent mechanisms.

    “Pups reared by an abusive mother during the SHRP receive CORT through her milk and her ability to socially buffer this CORT elevation is compromised; when these pups are trained on a peppermint odor-shock conditioning paradigm outside the nest at PN7, they will learn an aversion through amygdala-dependent mechanisms (Moriceau et al., 2004, Raineki et al., 2010b).”
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    At PN10, stressful stimuli produce a more immediate increase in pups' CORT levels, and the presence of the mother completely blocks its release.

    “Specifically, at PN10, stressful stimuli begin to produce a more immediate increase in pups’ CORT levels, and the presence of the mother completely blocks its release (Moriceau et al., 2006, Stanton and Levine, 1990, Suchecki et al., 1993).”
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    During the transitional sensitive period, maternal presence modulates whether pups learn to avoid or prefer an odor paired with shock; this process depends on amygdala serotonin and CORT levels.

    “In particular, during this transitional sensitive period, maternal presence can modulate whether pups learn to avoid or prefer an odor paired with shock; this process depends on amygdala serotonin and CORT levels (Moriceau et al., 2006) (Fig. 2).”
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    Amygdala-dependent deficits are task-specific: amygdala hyperactivity underlies decreased social exploration in adolescence and depressive/anxiety-like behavior in adulthood, in parallel with impaired threat aversion learning and blunted amygdala activation during fear conditioning.

    “Amygdala-dependent deficits are expressed in a task-specific manner: amygdala hyperactivity underlies decreased social exploration in adolescence and depressive and anxiety-like behavior in adulthood (Fig. 2), in parallel with impaired ability to learn aversions to threat and blunted amygdala activation during fear conditioning (Raineki et al., 2012, Sevelinges et al., 2007, Sevelinges et al., 201”
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    Premisecitation

    Pairing an odor with a moderately painful foot-shock (0.5 mA) or tail-pinch produces an odor preference in young pups; the procedure also produces a new maternal odor that pups prefer.

    “Just as new maternal odors can be learned when a previously neutral odor is paired with stimuli evoking maternal care, such as milk or stroking, we paired an odor with a moderately painful foot-shock (0.5 mA) or tail-pinch; this produced an odor preference in young pups (Camp and Rudy, 1988, Haroutunian and Campbell, 1979, Spear, 1978, Sullivan et al., 1986); we later showed this procedure also”
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    Abused pups or pups injected with CORT can learn arbitrary odor aversions via premature amygdala engagement, but always show a preference for the maternal odor.

    “It is important to note that, although abused pups or pups injected with CORT can learn arbitrary odor aversions (eg. peppermint) via premature amygdala engagement, they will nevertheless always show a preference for the maternal odor.”
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    Premisecitation

    Both rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment produce latent changes in amygdala function.

    “Both of these manipulations produces latent changes in amygdala function and depressive-like behavior, aberrant fear expression, and social behavior deficits (Perry et al., in press; Raineki et al., 2010b, Raineki et al., 2010c, Raineki et al., 2015, Roth et al., 2014, Sevelinges et al., 2007, Sevelinges et al., 2011, Sevelinges et al., 2008).”
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    • Rests on an assumption: Rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment are valid models of caregiver abuse in rodents.
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    Premisecitation

    Rats with history of caregiver abuse show impaired response to predator odor threat and amygdala dysfunction.

    “Rats with a history of caregiver abuse show impaired response to a salient predator odor threat and amygdala dysfunction, suggesting that maintenance of a social hierarchy may also be compromised in these animals (Perry et al., in press) (Fig. 3).”
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    Dominant rats show enhanced adult neurogenesis in the ventral dentate gyrus; effect also shown in baboons.

    “Specifically, dominant rats show enhanced adult neurogenesis in the ventral dentate gyrus of the hippocampal formation, an effect that also has been shown in baboons (Kozorovitskiy and Gould, 2004, Peragine et al., 2014, Wu et al., 2014).”
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    Interpretationreasoning

    Early life provides a sensitive window for programming lifelong emotional and cognitive processing, influencing threat-processing and social behaviors.

    “Early life provides a sensitive window for programming lifelong emotional and cognitive processing, which has profound influence over threat-processing and social behaviors.”
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    Animal models across a variety of species have allowed assessment of the mechanisms by which caregiver abuse engenders neurobehavioral deficits, with programming of the stress system as a point of convergence in adult outcomes.

    “Animal models across a variety of species have allowed us to assess the mechanisms by which caregiver abuse engenders neurobehavioral deficits, with programming of the stress system as a point of convergence in adult outcomes (Andersen and Teicher, 2008, Denenberg, 1963, Famularo et al., 1992, Harlow and Harlow, 1965, Hofer, 1994, Levine, 1957, Levine et al., 1985, Teicher et al., 2003).”
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    Premisecitation

    In non-human primates, infant amygdala lesions lead to decreased fear response to normally threatening stimuli and enhanced response to novel social situations.

    “The most dramatic developmental differences were first observed in non-human primates, where infant amygdala lesions lead to decreased fear response to normally threatening stimuli and an enhanced response to novel social situations (Amaral, 2002, Amaral, 2003).”
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  • May combine two claims.

    Premisecitation

    In LE rats in laboratory enclosure, subordinate rats have elevated CORT compared to dominants and can be prone to illness and weight loss due to chronic stress.

    “When LE rats form a dominance hierarchy within a laboratory enclosure, it has been shown that subordinate rats have elevated levels of CORT compared to dominants and can be prone to illness and weight loss due to chronic stress (Blanchard et al., 1995, Hardy et al., 2002).”
    Quote in the paperNot a substantial claim0 of 2 sources checked
    • cites Blanchard et al., 1995 source

      Not checked in the free run.

    • cites Hardy et al., 2002 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    In humans, the amygdala is implicated in social behavior in adults and during development.

    “In humans, the amygdala is implicated in social behavior in adults (Thomas et al., 2001), as well as during development (Skuse et al., 2003, Tottenham and Sheridan, 2009).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Thomas et al., 2001 source

      Not checked in the free run.

    • cites Skuse et al., 2003 source

      Not checked in the free run.

    • cites Tottenham and Sheridan, 2009

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Individuals with history of abuse or disordered attachment exhibit compromised fear and social behavior, and vulnerability to later-life mental health disorders.

    “In the clinical literature, this has been demonstrated in individuals with a history of abuse or disordered attachment who exhibit compromised fear and social behavior, as well as vulnerability to later-life mental health disorders (Bowlby, 1984, Bremner, 2003, Famularo et al., 1992, Graham et al., 1999, Nemeroff and Vale, 2005, Pechtel et al., 2014).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Bowlby, 1984 source

      Not checked in the free run.

    • cites Bremner, 2003 source

      Not checked in the free run.

    • cites Famularo et al., 1992 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Repeatedly experiencing trauma associated with caregiver cues during the sensitive period has a unique neural signature, producing latent changes in amygdala function to program emotionality and social behavior throughout the lifespan.

    “Taken together, these findings suggest that repeatedly experiencing trauma associated with caregiver cues during the sensitive period for attachment has a unique neural signature, producing latent changes in amygdala function to program emotionality and social behavior throughout the lifespan.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    Caregiver abuse in early life produces enhanced aggression, impaired threat response, depressive/anxiety-like behavior, and decreased social exploration.

    “These factors may be compromised in cases of caregiver abuse in early life, which produces enhanced aggression (Marquez et al., 2013), impaired threat response (Perry, in press), depressive and anxiety-like behavior (Raineki et al., 2012, Raineki et al., 2015 and decreased social exploration (Raineki et al., 2015).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Marquez et al., 2013 source

      Not checked in the free run.

    • cites Perry, in press

      Not checked in the free run.

    • cites Raineki et al., 2012 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    The amygdala is not involved with social behavior in infancy; its activation can impair social behavior at this age.

    “This suggests that the amygdala is not involved with social behavior in infancy and its activation can, in fact, impair social behavior at this age.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisenone given

    Dominance hierarchies are complex social arrangements determined by individual differences that can result from early life experience.

    “Dominance hierarchies provide one example of a complex social arrangement determined by individual differences that can result from early life experience.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Pups exposed to abuse in the low bedding procedure and repeated odor-shock pairings form a disordered attachment to the mother, expressed in decreased approach to maternal odor, less nipple attachment, and amygdala hyperactivity if given CORT injections before testing.

    “This can also be modeled in rodents: pups that were exposed to abuse in the low bedding procedure and repeated odor-shock pairings form a disordered attachment to the mother, expressed in decreased approach behavior towards the maternal odor, less nipple attachment, and amygdala hyperactivity if given CORT injections before testing (Raineki et al., 2012).”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Raineki et al., 2012 source

      Not checked in the free run.

  • May combine two claims.

    Interpretationreasoning

    Early life may be a period of rapid change and heightened vulnerability of the amygdala to environmental influence, as well as multiple interconnected brain regions, including the hippocampus and PFC.

    “This suggests that early life may be a period of rapid change and, likewise, heightened vulnerability of the amygdala to environmental influence, as well as multiple interconnected brain regions, including the hippocampus and PFC (Ehrlich and Josselyn, 2016, Ehrlich et al., 2012, Lupien et al., 2009).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Ehrlich and Josselyn, 2016

      Not checked in the free run.

    • cites Ehrlich et al., 2012 source

      Not checked in the free run.

    • cites Lupien et al., 2009 source

      Not checked in the free run.

  • Probably not a substantial claim: may not pass S3 (load-bearing).

    Premisecitation

    Patients with depression show alterations in amygdala function and its connectivity with other brain areas.

    “For instance, patients with depression also show alterations in amygdala function and its connectivity with other brain areas (Elzinga et al., 2003, Frijling et al., 2016, Jedd et al., 2015, McEwen, 2003, Ressler and Mayberg, 2007, Savitz and Drevets, 2009, Sibille et al., 2009, Teicher et al., 2003).”
    Quote in the paperNot a substantial claim0 of 3 sources checked
    • cites Elzinga et al., 2003 source

      Not checked in the free run.

    • cites Frijling et al., 2016 source

      Not checked in the free run.

    • cites Jedd et al., 2015 source

      Not checked in the free run.

  • May combine two claims.

    Premisecitation

    Both rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment produce social behavior deficits.

    “Both of these manipulations produces latent changes in amygdala function and depressive-like behavior, aberrant fear expression, and social behavior deficits (Perry et al., in press; Raineki et al., 2010b, Raineki et al., 2010c, Raineki et al., 2015, Roth et al., 2014, Sevelinges et al., 2007, Sevelinges et al., 2011, Sevelinges et al., 2008).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Perry et al., in press

      Not checked in the free run.

    • cites Raineki et al., 2010b

      Not checked in the free run.

    • cites Raineki et al., 2010c

      Not checked in the free run.

    • Rests on an assumption: Rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment are valid models of caregiver abuse in rodents.
  • May combine two claims.

    Premisecitation

    Both rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment produce aberrant fear expression.

    “Both of these manipulations produces latent changes in amygdala function and depressive-like behavior, aberrant fear expression, and social behavior deficits (Perry et al., in press; Raineki et al., 2010b, Raineki et al., 2010c, Raineki et al., 2015, Roth et al., 2014, Sevelinges et al., 2007, Sevelinges et al., 2011, Sevelinges et al., 2008).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Perry et al., in press

      Not checked in the free run.

    • cites Raineki et al., 2010b

      Not checked in the free run.

    • cites Raineki et al., 2010c

      Not checked in the free run.

    • Rests on an assumption: Rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment are valid models of caregiver abuse in rodents.
  • May combine two claims.

    Premisecitation

    Both rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment produce depressive-like behavior.

    “Both of these manipulations produces latent changes in amygdala function and depressive-like behavior, aberrant fear expression, and social behavior deficits (Perry et al., in press; Raineki et al., 2010b, Raineki et al., 2010c, Raineki et al., 2015, Roth et al., 2014, Sevelinges et al., 2007, Sevelinges et al., 2011, Sevelinges et al., 2008).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Perry et al., in press

      Not checked in the free run.

    • cites Raineki et al., 2010b

      Not checked in the free run.

    • cites Raineki et al., 2010c

      Not checked in the free run.

    • Rests on an assumption: Rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment are valid models of caregiver abuse in rodents.
  • Classified as probably not a substantial claim. May combine two claims.

    Interpretationreasoning

    Early life is not only a sensitive period for rodent amygdala development, but also for humans.

    “In light of the relationship between attachment, the amygdala, and long-term mental health outcomes, we may predict that early life is not only a sensitive period for rodent amygdala development, but also for humans.”
    Quote in the paperSubstantial claim
  • May combine two claims.

    Premisecitation

    The amygdala undergoes major development progress throughout the first seven years of life in children but continues to develop into adolescence.

    “The amygdala undergoes major development progress throughout the first seven years of life in children but continues to develop into adolescence (Giedd et al., 1996, Humphrey, 1968, Letcher et al., 2009, Lupien et al., 2009, Tottenham and Sheridan, 2009, Uematsu et al., 2012, Ulfig et al., 2003).”
    Quote in the paperSubstantial claim0 of 3 sources checked
    • cites Giedd et al., 1996 source

      Not checked in the free run.

    • cites Humphrey, 1968 source

      Not checked in the free run.

    • cites Letcher et al., 2009 source

      Not checked in the free run.

52 of 52
  • The paper relies on this without support.

    The rodent model of abusive attachment is valid for understanding human attachment trauma.

    “Due to the unique neurobiology of the infant brain that is biased towards forming attachments, traumatic cues during the sensitive period for attachment are processed within the attachment circuitry rather than the threat processing circuitry.”
  • The authors state this as an assumption.

    The CORT injection in pups models a high-stress environment.

    “The CORT injection in pups models a high-stress environment, which appears necessary to uncover neurobehavioral deficits before weaning.”
  • The paper relies on this without support.

    Rough handling by the mother given low nesting resources and repeated presentations of paired odor-shock during the sensitive period for attachment are valid models of caregiver abuse in rodents.

    “Here we have focused on two very selective models of caregiver abuse in rodents, namely, rough handling by the mother given low nesting resources, and repeated presentations of paired odor-shock during the sensitive period for attachment.”
3 of 3

Claims other papers make about this one

Each is checked against this paper’s own text: does it say what the citing paper says it does?

  • In primates, including humans, non-biological parents can learn to care for children after instruction or observation of experienced caretakers and infants.

    “In primates, including humans, non-biological parents can learn to care for children after instruction or observation of experienced caretakers and infants1–8.”

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

Each contradiction between two passages listed here was confirmed by an independent check.

  • Sensitive-period boundary differs at PN9

    Minor

    The figure defines the attachment-learning sensitive period as PN < 9, excluding PN9. The text describes PN0-PN9 as the first ten days and says those ten days constitute the sensitive period.

1 of 1

Cites

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Cited by

Sorted by citations

Authors
Opendak, M., Gould, E., & Sullivan, R.
Affiliations
  • Nathan Kline Institute for Psychiatric Research (US)
  • Princeton University (US)
Corresponding author
Opendak, Maya
Venue
Developmental Cognitive Neuroscience
Publisher
Elsevier BV
Published
2017-06
Volume
25
Pages
145-159
ISSN
1878-9293 (ISSN-L)
OpenAlex
W2587922926
Cited by
94
References
305
Citations by year
2026: 6 · 2025: 10 · 2024: 12 · 2023: 12 · 2022: 11 · 2021: 17 · 2020: 7 · 2019: 14 · 2018: 1 · 2017: 3
FWCI
1.05
Type
journal article
Language
en
Update notices
erratum (2020-10-01)
Open access
Locations
  • Developmental Cognitive Neuroscience (publishedVersion, cc-by-nc-nd)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • National Institute of Mental Health (R01MH091451, F32MH112232, T32MH019524)
  • National Institute on Deafness and Other Communication Disorders (R01DC009910)
  • Eunice Kennedy Shriver National Institute of Child Health and Human Development (R37HD083217)
Topics
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Social Sciences › Psychology › Clinical Psychology › Child Abuse and Trauma
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
childhood adversity, attachment, threat processing, social behavior, amygdala, caregiver presence, trauma, dominance hierarchy, rodent models, psychobiology
MeSH terms
Amygdala, Animals, Brain, Child, Humans, Infant, Social Behavior, Caregivers

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Claims read by deepseek-v4.1-flash under definition version 3 (extract-v3) on 2026-10-09.

Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-09.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

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